Dust collecting structure of grinder

ABSTRACT

A grinder is provided with a dust collecting structure comprising a base, a motor, a dust collecting cover, a blast wheel, a grinding body, and a dust collecting canister. The base is provided with a port. The motor is mounted on the base. The dust collecting cover has an open end and an opening corresponding to the port of the base. The blast wheel is disposed in the dust collecting cover such that a channel is formed between the blast wheel and the dust collecting cover and is in communication with the port of the base. The blast wheel is driven by the motor to turn. The grinding body is disposed at the outer side of the blast wheel and is driven by the motor to grind a workpiece. The dust collecting canister is in communication with the port of the base for collecting the dust from the grinding body via the channel.

FIELD OF THE INVENTION

[0001] The present invention relates generally to a grinder, and more particularly to a dust collecting structure of the grinder.

BACKGROUND OF THE INVENTION

[0002] The conventional grinder comprises a base on which a motor is mounted to drive a grinding wheel. An adjustable workpiece platform is disposed on the base to facilitate the placing of a workpiece at various angles. The conventional grinder is not provided with a dust collector. As a result, the dust so produced in the grinding process is a serious air pollutant in the workplace and is hazardous to health (especially the lungs) of the workers.

SUMMARY OF THE INVENTION

[0003] The primary objective of the present invention is to provide a grinder with a dust collecting structure to minimize the pollution of air by the dust produced by the grinder in operation.

[0004] In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by the dust collecting structure which is formed of a base, a motor, a dust collecting cover, a blast wheel, a grinding body, and a dust collecting canister. The base is provided with a port. The motor is mounted on the base. The dust collecting cover has an open end and is provided with an opening which is corresponding in location to the port of the base. The blast wheel is disposed in the dust collecting cover and is driven by the motor to turn. The outer edge of the blast wheel and the dust collecting cover are provided therebetween with a channel in communication with the port of the base. The grinding body is disposed at the outer side of the blast wheel and is driven by the motor to turn to carry out the grinding of a workpiece. The dust collecting canister is in communication with the port of the base for collecting the dust.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005]FIG. 1 shows an exploded view of a preferred embodiment of the present invention.

[0006]FIG. 2 shows a perspective view of the preferred embodiment of the present invention.

[0007]FIG. 3 shows a schematic view of the preferred embodiment of the present invention at work.

DETAILED DESCRIPTION OF THE INVENTION

[0008] As shown in all drawings attached hereto, a dust collecting structure of the preferred embodiment of the present invention is designed for use in a grinder and is formed of component parts which are described hereinafter.

[0009] A base 10 has a base slot 11, an open upper side, and an open front side. The base 10 is provided in the right side with a port 12 which is in turn provided in the outer side with a port connecting member 13. The open front side of the base slot 11 is sealed off by a cover piece 14. The base 10 is mounted on a base supporting frame 100 of an appropriate height.

[0010] A motor 20 is mounted securely on the base 10 and has a switch 21 for turning on or off the motor 20.

[0011] A dust collecting cover 30 is of a round shape and has an open end. The cover 30 is of a shell-like body and is provided in the upper edge with an arcuate cover piece 31, and in the lower side with an opening 32. The cover 30 is disposed in the base slot 31 of the base 30 such that the opening 32 of the cover 30 is disposed in the port 12 of the base 10. The cover 30 is provided in the center of the bottom thereof with a through hole 33 through which a transmission shaft of the motor 20 is put. The through hole 33 is provided in periphery with four fixation holes 34 circumventing the through hole 33. The cover 30 is fixed to the motor 20 by four screws 35 which are received in the four fixation holes 34.

[0012] A blast wheel 40 is disposed in the dust collecting cover 30 and is provided in periphery with a plurality of blades 41 which are arranged at a predetermined angle. The wheel 40 is provided at the center with a through hole 42 in which a bearing 43 is disposed such that the transmission shaft of the motor 20 is put through the bearing 43 so as to enable the blast wheel 40 to be driven by the motor 20. A channel 50 is formed between the outer edge of the blast wheel 40 and the dust collecting cover 30 such that the channel 50 is in communication with the port 12 of the base 10.

[0013] An elastic ring 60 of a rubber material is disposed at the outer side of the blast wheel 40 and is fixed to the dust collecting cover 30 for making the center of the blast wheel 40 airtight.

[0014] A grinding body 70 is disposed at the outer side of the elastic ring 60 and is driven by the motor 20 to grind a workpiece. The grinding body 70 of the preferred embodiment of the present invention comprises a sanding cloth seat 71 and a sanding cloth 72. The sanding cloth seat 71 is a round plate body and is disposed at the outer side of the ring 60. The sanding cloth seat 71 is provided at the center with a through hole 711 through which the transmission shaft of the motor 20 is put such that the outer end of the transmission shaft is fastened with the sanding cloth seat 71 by a nut 73. As a result, the sanding cloth seat 71 can be driven by the motor 20 to turn. The sanding cloth 72 is attached to the outer end of the sanding cloth seat 71 for grinding the workpiece. The grinding body 70 of the present invention may be a conventional grinding wheel in place of the sanding cloth seat 71 and the sanding cloth 72.

[0015] A work platform 80 is located at the outer side of the grinding body 70 and is provided at the bottom with two swiveling seats 85, with each having an arcuate slide rail 851. The base 10 is provided with two pivoting seats 15, with each being corresponding to the swiveling seat 85 and having an arcuate slide groove 151 in which the slide rail 851 of the swiveling seat 85 is pivotally disposed, thereby enabling the work platform 80 to be adjusted in angle to facilitate the grinding operation of the workpiece. The work platform 80 is a conventional device.

[0016] A dust collecting canister 90 has an open end, and a filter which is disposed in the interior thereof The open end is provided with a connection member 93. A connection tube 94 is connected at one end with the connection member 13 of the port 12 of the base 10 by a fastening ring 95, and at other end with the connection member 93 of the dust collecting canister 90. The dust collecting canister 90 is thus in communication with the port 12 of the base 10 and the channel 50.

[0017] As the motor 20 is started, the blast wheel 40 and the grinding body 70 are driven to turn, thereby resulting in an air current which is formed in the channel 50 by the blade 41 of the blast wheel 40. The air current is guided to the dust collecting canister 90 via the channel 50, the port 12, and the connection tube 94, as indicated by arrows in FIG. 3. As a workpiece on the work platform 80 is worked on by the sanding cloth 72 of the grinding body 70, the dust is spread out in the radiate manner. In light of the Bernoulli's Law, the dust is drawn into the channel 50 from the outer edge of the grinding body 70. The dust is carried along by the air current in the channel 50 to reach the dust collecting canister 90 via the port 12 of the base 10 and the connection tube 94 of the canister 90. The dust is trapped by the filter (not shown in the drawing) of the canister 90. 

What is claimed is:
 1. A dust collecting structure of a grinder, comprising: a base provided with a port; a motor mounted on said base; a dust collecting cover having an open end and an opening corresponding to said port of said base, said dust collecting cover being mounted on said base; a blast wheel disposed in said dust collecting cover and driven by said motor to turn, said blast wheel and said dust collecting cover being provided with a channel located therebetween such that said channel is in communication with said opening of said dust collecting cover; a grinding body disposed at an outer side of said blast wheel and driven by said motor to turn to grind a workpiece; and a dust collecting canister in communication with said port of said base for collecting dust from said grinding body via said channel and said port of said base.
 2. The dust collecting structure as defined in claim 1, wherein said base is provided with a base slot; wherein said port is located in an inner wall of said base slot; wherein said dust collecting cover is disposed in said base slot.
 3. The dust collecting structure as defined in claim 1, wherein said dust collecting cover is provided in an upper edge with an arcuate cover piece.
 4. The dust collecting structure as defined in claim 1 further comprising a ring located between said blast wheel and said grinding body.
 5. The dust collecting structure as defined in claim 1, further comprising a connection tube which is connected at one end with said port of said base, and at other end with said dust collecting canister.
 6. The dust collecting structure as defined in claim 1, wherein said grinding body comprises a sanding cloth seat and a sanding cloth, said sanding cloth seat being of a plate body and being located at an outer side of said blast wheel such that said sanding cloth seat is driven by said motor to turn, said sanding cloth being detachably fastened with said sanding cloth seat for grinding a workpiece.
 7. The dust collecting structure as defined in claim 1, wherein said grinding body is a grinding wheel.
 8. The dust collecting structure as defined in claim 1 further comprising a work platform which is pivotally mounted on said base. 